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quasar987

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lightgrav

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Algebra? Vector trig? Calculus? Diff.Eq?

IMHO, any instance where a theory is actually used

to describe a physical (real) situation (as an example)

that example is a "model" of reality.

You can't "prove" a model - you just try it,

then compare with the experiment.

If the model prediction is pretty close to the experiment,

you use that model again - if not, you toss it out.

If you're just starting, maybe most of the "equations"

are essentially definitions.

(Physics books tend to NOT distinguish equations with 3 lines).

Again, you can't prove a definition -

you keep useful ones and discard the non-useful ones.

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lightgrav said:

Algebra? Vector trig? Calculus? Diff.Eq?

IMHO, any instance where a theory is actually used

to describe a physical (real) situation (as an example)

that example is a "model" of reality.

You can't "prove" a model - you just try it,

then compare with the experiment.

If the model prediction is pretty close to the experiment,

you use that model again - if not, you toss it out.

If you're just starting, maybe most of the "equations"

are essentially definitions.

(Physics books tend to NOT distinguish equations with 3 lines).

Again, you can't prove a definition -

you keep useful ones and discard the non-useful ones.

I could not say I am far into it, but I studied good part of mechanics, optics and accoustics. I understand that physics is built around models, but some equation are derived from the models, what I am looking for is how such equations are obtained.

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